Berberis nervosa

Pursh

Fl. Amer. Sept., 219. 1814.

EndemicIllustrated
Synonyms: Berberis nervosa var. mendocinensis Roof Mahonia nervosa (Pursh) Nuttall Mahonia nervosa var. mendocinensis (Roof) Roof
Treatment appears in FNA Volume 3.

Shrubs, evergreen, 0.1-0.8 (-2) m. Stems monomorphic, without short axillary shoots. Bark of 2d-year stems brown or yellowbrown, glabrous. Bud-scales (13-) 20-44 mm, persistent. Spines absent. Leaves 9-21-foliolate; petioles 2-11 cm. Leaflet blades thin and ± flexible; surfaces abaxially rather dull, smooth, adaxially dull, somewhat glaucous; terminal leaflet stalked, blade 2.9-8.4 × 1.2-4.8 cm, 1.8-3.2 times as long as wide; lateral leaflet blades lanceovate to ovate, 4-6-veined from base, base rounded to cordate, margins plane, toothed, each with 6-13 teeth 1-2 (-3) mm tipped with spines to 1-2.4 × 0.1-0.2 mm, apex acute or broadly acuminate. Inflorescences racemose, dense, 30-70-flowered, 6-17 cm; bracteoles membranous, apex acute, obtuse, or rounded. Flowers: anther-filaments without distal pair of recurved lateral teeth. Berries blue, glaucous, oblong-ovoid or globose, 8-11 mm, juicy, solid. 2n = 56.


Phenology: Flowering winter–spring (Mar–Jun).
Habitat: Open or shaded woods, often in rocky areas
Elevation: 0-1800 m

Distribution

V3 479-distribution-map.gif

B.C., Calif., Idaho, Oreg., Wash.

Discussion

Plants of Berberis nervosa are usually very low (commonly 0.1-0.3 m), but occasional plants may be considerably taller (to 2 m). One such population from north of Westport, California, has been separated as B. nervosa var. mendocinensis. Similar populations occur sporadically throughout the range of B. nervosa, so the form should not be recognized taxonomically.

Berberis nervosa is resistant to infection by Puccinia graminis.

The Skagit tribe used Berberis nervosa medicinally in a root preparation to treat venereal disease (D. E. Moermann 1986).

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Berberis nervosa"
Alan T. Whittemore +
yellowbrown +  and brown +
rounded;cordate +
Mahonia +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
2.9 cm29 mm <br />0.029 m <br /> (8.4 cm84 mm <br />0.084 m <br />) +
obovate +, oblanceolate +  and elliptic +
1.2 cm12 mm <br />0.012 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
1.2cm;4.8cm +
scale-like +
1.3 cm13 mm <br />0.013 m <br /> (2 cm20 mm <br />0.02 m <br />) +
2 cm20 mm <br />0.02 m <br /> (4.4 cm44 mm <br />0.044 m <br />) +
B.C. +, Calif. +, Idaho +, Oreg. +  and Wash. +
0-1800 m +
small +  and large +
showy +  and inconspicuous +
0.3 cm3 mm <br />0.003 m <br /> (?) +  and 0.8 cm8 mm <br />0.008 m <br /> (?) +
compound +  and simple +
spheric +  and cylindric-ovoid or ellipsoid +
Open or shaded woods, often in rocky areas +
axillary +  and terminal +
6 cm60 mm <br />0.06 m <br /> (17 cm170 mm <br />0.17 m <br />) +
9-21-foliolate +
reduced +
toothed;plane +
1-carpellate +
basal +  and superior +
club--shaped +
3-merous +  and 2-merous +
nectariferous +
distinct +
2 cm20 mm <br />0.02 m <br /> (11 cm110 mm <br />0.11 m <br />) +
Flowering winter–spring (Mar–Jun). +
Fl. Amer. Sept., +
not nodose +
1 +  and 10 +
distinct +
elongate +
Endemic +  and Illustrated +
1mm;2.4mm +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
elongating +
monomorphic +
with elongate primary-stems and short axillary spur shoots +  and elongate +
palmate +  and pinnate +
persistent +
Berberis nervosa var. mendocinensis +, Mahonia nervosa +  and Mahonia nervosa var. mendocinensis +
Berberis nervosa +
Berberis +
species +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
glabrous +  and with tomentose stems +